It was reported on the second floor, according to officials.
Sprinklers inside the building were able to make quick work of the small fire, though there was smoke permeating throughout parts of the arena that crews had to ventilate upon their arrival.
No injuries were reported. It is unclear what caused the fire.
The Wizards are still set to play the Phoenix Suns inside Capital One Arena at 3:30 p.m. on Feb. 4.